Year	kt of CO2 equivalent
1970	42.3062976
1971	42.7869478
1972	43.2866131
1973	43.7245901
1974	44.130957
1975	44.4819076
1976	131.6337457
1977	135.0553194
1978	358.990001
1979	409.505485
1980	424.783771
1981	519.001013
1982	564.023574
1983	530.385687
1984	571.038292
1985	642.147964
1986	435.85886
1987	616.928696